[Paraview] VRPlugin: small build issue with vrpn

[Johannes Zarl]

Hi,

Today I tried the current paraview git master with the VRPlugin&VRPN enabled. 
A smaller annoyance is that the build system refuses to build when libusb.h is 
not installed (Even though libusb is not required by paraview or vrpn).

Explicitly setting VRPN_LIBUSB_INCLUDE_DIR to be empty instead of "-notfound" 
fixes the issue for me (see patch).

Cheers,
  Johannes
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